Everything You Need to Know About the Chem-X Refurbished ST-164 Dual Foam Injector Valve

At Chem-X, performance and value go hand-in-hand—and that’s exactly what you get with the Refurbished ST-164 Dual Foam Injector Valve. Whether you're looking to build a professional-grade 2-step foam system or replace a worn component without breaking the bank, this factory-refurbished injector delivers all the functionality of a brand-new unit at a more affordable price.

In this post, we’ll walk through what the refurbished ST-164 is, how it works, what’s inspected during the refurbishment process, and who it’s best suited for.

Now Available with Exchange Option

Need a repair or looking to save on your next ST-164?

You no longer need to go through customer service! You can now purchase a Refurbished ST-164 Dual Injector Valve at a discounted price—either outright or through our exchange program. When you choose the exchange option, your order includes a prepaid return slip to send back your used injector. Once we receive your original unit, you'll get a $300 credit applied to your purchase. It's an easy, cost-effective way to upgrade or replace your injector while also reducing waste.

Click here: https://www.chem-x.com/products/refurbished-st-164 to go to the product page

What Is the ST-164 Dual Foam Injector?

The Suttner ST-164 is a dual-line downstream chemical injector designed for professional pressure washing systems. It allows you to draw from two separate chemical sources (such as Stars and Stripes) and switch between them instantly using a built-in selector lever. No swapping tubes. No changing nozzles.

It’s one of the most efficient and time-saving tools for 2-step touchless washing—and it’s a favorite among Chem-X users for good reason.

What Makes the Refurbished Version Special?

The Chem-X Refurbished ST-164 is a fully functional injector that has been:

Thoroughly inspected by Chem-X technicians
Tested for leaks and valve function
Fitted with new internal seals, o-rings, or dosing nozzles as needed
Cleaned and restored to working condition
Offered at a discounted price compared to new units

While it may show minor cosmetic signs of use (light scratches, faded markings), it performs exactly as intended—and is backed by Chem-X's quality control standards.

Key Features (Refurbished or New):

Dual chemical inlets (Red + Blue sides)
Built-in lever for switching between chemicals or turning off draw
Up to 18 metering nozzles (pre-installed with a 100:1 setting)
Max PSI: 4,000 PSI
Max Flow: 18 GPM
Max Temp: 212°F
Stainless steel internal components
Compatible with most pressure washer setups and foamers

Ideal Pairing: Chem-X Stars + Stripes

The ST-164 is specifically designed for 2-step wash systems, and Chem-X’s Stars + Stripes are the perfect match. Simply connect:

Blue pickup tube to Stars (acidic pre-soak)
Red pickup tube to Stripes (alkaline neutralizer)

Then use the selector lever to apply each soap in order—no time wasted switching tubes or connections. It’s a true plug-and-play setup when used with a Freedom Foamer Lance.

Why Choose the Refurbished ST-164?

Save money while still getting professional-grade performance
Great for building a second rig or backup setup
Inspected and tested by Chem-X technicians
Eco-friendly—extends the life of high-quality hardware
Ships ready to install and use

Installation + Maintenance Tips

Always install the injector downstream of your pump
Use with foamers or soap nozzles that create low backpressure
Flush with clean water after each use, especially with high-alkaline soaps
Replace pickup tubes and strainers periodically
Inspect the selector lever for smooth rotation—lubricate if needed

Final Thoughts

The Refurbished ST-164 Dual Foam Injector Valve is a smart investment for anyone running a 2-step wash system. You get the same switching convenience, chemical control, and build quality of the full-price unit—just with a little more character and a lot more value.

If you're looking for professional performance on a tighter budget, or want to make the most of your old injector, the refurbished ST-164 with exchange option is the best of both worlds.